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Professional ballerina and trainer Mary Helen Bowers is the guru behind Natalie Portman's whipping into shape for her role in Black Swan.

Her Ballet Beautiful programme includes 24-hour training, custom workouts and live classes for a monthly fee of just $39.95.

Considered the Netflix of fitness, unlike your regular gym membership, classes can be done anywhere, at any time.

2. Crunch Gym Live

A well-established gym franchise in the US, Crunch Gym Live are also cashing in on the trend by offering classes online. You can start out with a free 10-day trial before you sign on to pay for live-streamed workouts.

3. Befit

YouTube channel Befit offers a range of free classes online from some of the industry's top instructors including Jillian Michaels and Denise Austen.

Arranged into categories including cardio fat-burn, dance, yoga and 10 minutes or less they range from HIIT (High Intensity Interval Training) to Dirty Dancing choreography.

4. Udaya

This online yoga studio offers a range of classes shot from a tranquil yoga studio. Membership gets you five new yoga classes a week and access to Udaya's fitness challenges.